13921388550 has 72 divisors (see below), whose sum is σ = 38608689600. Its totient is φ = 3592612800.

The previous prime is 13921388531. The next prime is 13921388557. The reversal of 13921388550 is 5588312931.

13921388550 is a `hidden beast` number, since 1 + 3 + 9 + 2 + 13 + 88 + 550 = 666.

It is a super-2 number, since 2×13921388550² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 13921388496 and 13921388505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921388557) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 485025 + ... + 512924.

It is an arithmetic number, because the mean of its divisors is an integer number (536231800).

Almost surely, 2^13921388550 is an apocalyptic number.

13921388550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13921388550 is an abundant number, since it is smaller than the sum of its proper divisors (24687301050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13921388550 is a wasteful number, since it uses less digits than its factorization.

13921388550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997998 (or 997990 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 13921388550 in words is "thirteen billion, nine hundred twenty-one million, three hundred eighty-eight thousand, five hundred fifty".